In various locations in a world, Instant mining of blocks can make the game shaky. Notice how the blocks breaking become black, along with the particle effects of them breaking. Even in the clip attached you can see that it is not constant, based on where i am mining but certain areas of a world seem to cause this.
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kuemmi
I reported a similar issue, with another video (MC-156450). 1.14.4-pre5 is affected as well.
This is easy to reproduce by mining crops while moving and looking at the dirt below.
tryashtar
Forward-resolve to MC-156451
violine1101
With this being near a mineshaft with probably lots of fences in it, I think it's more likely that this is caused by MC-123584. However, without any information about the environment we cannot say anything specific about what caused this issue.
The video seems to have been recorded in 1.14.2 (I assume?), so it cannot be MC-156451.